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Changes in leaf hydraulic conductance during leaf shedding in tropical dry forest

Citation

Brodribb, TJ and Holbrook, N, Changes in leaf hydraulic conductance during leaf shedding in tropical dry forest, New Phytologist , 158, (2) pp. 295-303. ISSN 0028-646X (2003) [Refereed Article]

DOI: doi:10.1046/j.1469-8137.2003.00736.x

Abstract

• The hydraulic conductance of leaves (kleaf) was examined to determine whether this little understood component of the water transport pathway plays a role in governing leaf phenology of two deciduous dry forest trees (Calycophyllum candidissimum and Rhedera trinervis). • kleaf was monitored in parallel with stem hydraulic conductivity (Kstem) during the transition from wet to dry season. The relationships between declining photosynthetic quantum yield during senescence and declining kleaf and Kstem were compared. • Divergent patterns were observed in the response of Kstem to seasonal drying; however, the behaviour of kleaf was essentially similar in both species. Large (five- to ten-fold) decreases in leaf hydraulic conductance occurred before, and during the later stages of leaf senescence. During senescence, declining kleaf, which continued until leaves were ultimately shed, was associated with a concomitant decline in quantum yield. • We conclude that, in these species, the loss of hydraulic conductance of the leaf vascular system is linked to, and possibly responsible for, the loss of photosynthetic capacity during leaf senescence.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Plant Biology
Research Field:Plant Physiology
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Environmental Sciences
Author:Brodribb, TJ (Professor Tim Brodribb)
ID Code:47879
Year Published:2003
Web of Science® Times Cited:79
Deposited By:Plant Science
Deposited On:2007-12-04
Last Modified:2007-12-04
Downloads:0

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